JPS598883B2 - magnetic recording and reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for recording and reproducing image signals using a magnetic recording medium such as a magnetic disk, and the present invention relates to an apparatus for recording and reproducing image signals using a magnetic recording medium such as a magnetic disk. The purpose of this invention is to provide a device that can do this.

In a magnetic recording/reproducing device such as a magnetic disk memory device in which a recording medium is rotated by a motor, the time from when the power is turned on and the motor starts rotating until it reaches a predetermined rotation speed (that is, until the servo lock is completed) is a few seconds to 10
It takes about seconds.

Furthermore, in the case of still image broadcasting, after the servo lock is completed, the viewer requests or selects the desired still image information, identifies the required still image image signal sent based on this information, and transmits it to the magnetic recording and reproducing device. It records and plays back,
It takes a certain amount of time from the completion of this servo lock until the first requested image is displayed, although the time may vary depending on the system. From the time the power is turned on until the first image is displayed on the monitor TV, various display methods can be considered on the monitor TV. A possible solution would be to display a signal that does not The present invention aims to provide an apparatus that can effectively display a predetermined specific image such as "Preparing to receive a still image" during such a period.

Therefore, the present invention is characterized in that the above-mentioned specific image is recorded in advance on a recording medium such as a magnetic disk so that it cannot be erased, and is displayed during the above-mentioned period. In this case, from the time the power is turned on until the servo lock is completed, even if you try to display this specific image, the image will not be normal because the magnetic disk, etc. has not reached the specified rotation speed, and the screen will be meaningless. When this becomes a normal image, it also has the effect of notifying the viewer that the servo lock has been completed, further improving the convenience of operation. An embodiment of the present invention will be described below with reference to the accompanying drawings. The configuration of the device is shown in FIG. 1, and the time chart is shown in FIG. 2. In FIG. 1, two magnetic heads 4 and 6 are provided for recording and reproducing information on a magnetic disk 5, which is a recording medium of a magnetic disk type recording and reproducing device. There are tracks 12 and 13 of disk 5. On the track 13, an image signal SO of a predetermined specific image (hereinafter referred to as SO) such as "preparing to receive static surface" is recorded in advance by the magnetic head 6, and after recording, it can be erased and recorded. Processing is performed to record and save this image signal SO for a long time so that it is not possible. On the other hand, still image information sent through broadcasting, etc. is received by the receiving circuit 1, and an image signal of 8V selected from among the images to be recorded and reproduced (hereinafter referred to as SV) is sent to the terminal 1a after appropriate signal processing.
The signal is outputted from the recording amplifier 2, amplified by the recording amplifier 2, and recorded on the track 12 of the magnetic disk 5 by the magnetic header 4.

Switch 3 gives instructions for recording or playback.
The output of the recording amplifier 2 is electrically connected to the position a during the period when the output is to be recorded on the magnetic disk 5, and to the position b during the period when the image signal SV recorded on the magnetic disk 5 is to be reproduced. Image signal SO,s recorded on the magnetic disk 5
When reproducing the track 12, the image signal Sv of the track 12 is picked up by the head 4 and amplified by the reproducing amplifier 7, and the image signal SO of the track 13 is picked up by the head 6, amplified by the reproducing amplifier 8, and the mixer is used. Enter 9.

Furthermore, a desired image signal Sv is selected from among the still image signals being transmitted.
The image signal Sv input to the recording amplifier 2 is sent to the mixer 9 for display on the monitor TV while recording.
Also input. In this way, the three types of image signals mentioned above are input to the mixer 9, and the image signal of the image to be displayed at that time is selected and output from the three types of image signals. A command signal for image selection in the mixer 9 is generated by an image selection control circuit 14. The output signal of the mixer 9 is subjected to predetermined signal processing in a reproduction section signal processing circuit 10, and then input to a monitor television 11 and displayed on its cathode ray tube. Next, using the time chart shown in FIG. 2, the display operation of the monitor television in this apparatus after the power is turned on will be explained. Here, A is an image signal Sv of a still image transmitted by still image broadcasting, and s1 to Sl7 respectively indicate image signals with different image contents. B is track 13 of magnetic disk 5
C is a command signal generated from the image selection control circuit 14 to instruct the mixer 9 to output the image signal SO recorded in is output from the mixer 9, and I)
is a command signal generated from the image selection control circuit 14 to instruct the mixer 9 to output the image signal Sv read from the track 12 of the magnetic disk 5. Each command signal B, C. Signal selection is commanded with both D and high level H. On the other hand, on the time axis, time T1 is when the power is turned on,
Time T2 indicates the time when the servo lock is completed, and at time T3, the viewer issues a program selection instruction using a keyboard or the like to specify image Sl2 from among the still images being transmitted, and image Sl2 is selected from among the still images being transmitted. This indicates that image identification is performed at time T4 when is transmitted. E indicates an image displayed on a television monitor. The command signal B is at a high level from the power-on time T1 to the image identification time T4, and during this period, the command signal B recorded on the track 13 of the magnetic disk 5 is
Image signal SO of a predetermined image SO such as "Preparing to receive still image"
Read out, output, and display. At this time, power-on time T
Since the servo lock is not performed from 1 to the servo lock completion time T2, this image SO is not displayed as a normal screen, but from the servo lock completion time T2, the image SO is normally displayed to indicate that the servo lock is completed. During one frame period from the image identification time T4, the command signal C becomes a high level H, and the image signal Sl2 of the instructed image Sl2 is selected from the image signal A of the still image being transmitted, and the mixer 9, the image Sl2 is displayed on the monitor television, and the image signal Sl2 of the image Sl2 is recorded on the track 12 of the magnetic disk 5. After that, the command signal D becomes high level H, and the image signal Sl2 recorded on the track 12 is read out repeatedly, and the image Sl2 is continuously reproduced and displayed on the monitor TV 1.
Display on 1. In this way, according to this device,
A predetermined specific image such as "Preparing to receive a still image" can be displayed between the time the power is turned on and the first requested still image is displayed, causing discomfort to the viewer during this period. In addition, when this particular image becomes normal, it indicates that the servo lock has been completed, and the viewer can be informed that the desired normal still image can be recorded and reproduced from then on. .

Although the above description has been made using a magnetic disk as an example, the present invention can also use any other recording medium such as a magnetic sheet or an endless magnetic tape.

Also, as a means of detecting when the servo lock is completed,
What is necessary is to detect a control signal for servo control. For example, if a reference signal for servo control is recorded in a recording medium, and the phase of the reference signal read out during playback is compared with a predetermined reference signal to obtain a control signal for servo control, By detecting the magnitude of this control signal, it is possible to know the completion of the servo lock. Furthermore, in the embodiment described above, the image signal SO of the specific image SO is read out and displayed until the image signal Sv of the desired image SV is started to be recorded. If it is not necessary to display the image SV, the image signal SO is not displayed until the reproduction of the image signal Sv is started.
All you have to do is read out the . Furthermore, in addition to receiving and reproducing the image signal of a still image as described above, the apparatus of the present invention can also convert an image of a normal television broadcast image into an arbitrary image S.
Needless to say, this method can also be applied to recording and reproducing as V. As described in detail above, the magnetic recording/reproducing apparatus of the present invention has a track in which an image signal that generates a specific image is recorded in such a way that it cannot be erased in advance, and an image signal that generates another arbitrary image is recorded. A magnetic recording medium such as a magnetic disk having a track, a magnetic head for recording and reading out image signals recorded on the magnetic recording medium, and a method for determining which of the above two image signals is read out from the magnetic recording medium. and means for switching,
The device is characterized in that the image signal for displaying the specific image is read from the magnetic recording medium from the time the power is turned on until the recording or reproduction of the image signal for displaying the arbitrary image is started. By playing this specific image between the time the power is turned on and the time when a desired image is recorded and played back, viewers are less likely to feel uncomfortable, and moreover, the completion of servo lock can be notified. This allows for effective display.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIGS. 2A, B, C, D, and E are time charts for explaining the operation of the apparatus. 1a...signal input terminal, 2...recording amplifier, 3...switch (for switching between recording and playback modes), 4, 6...magnetic head , 5...
・Disc-shaped magnetic disk, R, 8... Regenerative amplifier, 9... Mixer, 10... Reproducing section signal processing circuit, 11... Monitor TV , 12...
. . . Track for an arbitrary image, 13 . . . Track for a specific image, 14 . . . Image selection control circuit.

Claims (1)

[Claims] 1. A magnetic recording medium such as a magnetic disk, which has a track in which an image signal representing a specific image is irrevocably recorded in advance, and a track in which an image signal representing any other image is recorded, and this magnetic recording medium. An image signal representing the arbitrary image described above from the time the power is turned on, comprising a magnetic head for recording and reading an image signal on a medium, and means for switching which of the two image signals is read from the magnetic recording medium. A magnetic recording and reproducing apparatus, characterized in that an image signal representing the specific image is read from the magnetic recording medium until recording or reproducing of the image is started.